SAGAR SINGH - IIT DELHI
Last Activity: 14 Years ago
Dear sachin,
The motion of the arrow is a projectile motion. Then the motion of the arrow along horizontal direction is a motion with constant velocity:
Where the initial position is 0 and . Then
Motion along vertical axis is a motion with constant acceleration, then
Where , initial position is 0, and . Then
Then we need to find the time when the arrow will be exactly above the assistant. At this moment of time x(t) =100. Then we can find the time:
Then we can find the height of the arrow at this moment of time:
The assistant should through the apple with minimal velocity so it will reach point 5.4 m and at this height the velocity should be 0. From this condition we can find the minimal velocity:
The time of the motion of the apple to this point is
Then the apple should be thrown after
Please feel free to ask your queries here. We are all IITians and here to help you in your IIT JEE preparation.
All the best.
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Sagar Singh
B.Tech, IIT Delhi